<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="demo">
        <h1>虚拟DOM</h1>
        <p>{{ foo }}</p>
    </div>
    <script src="./js/vue.js"></script>
    <script>
        // 创建实例
        const app = new Vue({
            el: '#demo',
            data: {
                foo: 'foo'
            },
            mounted () {
                setTimeout(() => {
                    this.foo = 'foooooo'
                }, 1000)
            }
        })
    </script>
</body>
</html>